Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| From | Piotr Wyderski <peter.pan@neverland.mil> |
|---|---|
| Newsgroups | comp.dsp |
| Subject | How to downsample this signal? |
| Date | 2017-05-13 09:23 +0200 |
| Organization | ATMAN - ATM S.A. |
| Message-ID | <of6c98$vve$1@node1.news.atman.pl> (permalink) |
Hello,
I have the 50Hz mains voltage signal sampled at 12bit/100kHz. This high
frequency is for rapid detection of overvoltage conditions. However, for
further processing this sample rate is way too high, so I'd like to
change the sampling rate by a factor ~100 (not a very critical value,
just "sensibly low").
The thing will be implemented on a PSOC5LP, which has a dedicated
digital filter block capable of ~32e6 FMACs per second with fixed
24 bit resolution. I'll use half of that for other purposes and would
like to retain data accuracy at least 12 bit. The dominant signal
is around 50Hz and its quality should remain high, especially the
phase relations.
Given that constraints, what architecture would you suggest to
do that? I was thinking about not using multiplication at all
(at least at the high freuency stage) and implement two cascaded
order 4, decimation ratio 8 CICs, which fit in the 24-bit registers
and provide combined decimation ratio of 64, which is fine. Then
clean up the output with a FIR. This combo worked years ago in
the FPGA world, where multiplication was a problem. But I think
I loose something important by not using the available MAC unit,
so could you please suggest me a better approach?
Best regards, Piotr
Back to comp.dsp | Previous | Next — Next in thread | Find similar
How to downsample this signal? Piotr Wyderski <peter.pan@neverland.mil> - 2017-05-13 09:23 +0200
Re: How to downsample this signal? Evgeny Filatov <filatov.ev@mipt.ru> - 2017-05-13 15:42 +0300
Re: How to downsample this signal? bitterlemon40@yahoo.ie - 2017-05-13 07:53 -0700
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-13 11:48 -0400
Re: How to downsample this signal? Randy Yates <yates@digitalsignallabs.com> - 2017-05-13 12:58 -0400
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-13 16:04 -0400
Re: How to downsample this signal? Randy Yates <yates@digitalsignallabs.com> - 2017-05-14 14:19 -0400
Re: How to downsample this signal? Piotr Wyderski <peter.pan@neverland.mil> - 2017-05-15 00:42 +0200
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-15 00:46 -0400
Re: How to downsample this signal? Piotr Wyderski <peter.pan@neverland.mil> - 2017-05-15 07:21 +0200
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-15 10:51 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-15 11:49 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-15 17:20 -0400
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-16 02:59 -0400
Re: How to downsample this signal? eric.jacobsen@ieee.org - 2017-05-16 15:59 +0000
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-16 15:36 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 13:11 -0400
Re: How to downsample this signal? eric.jacobsen@ieee.org - 2017-05-16 18:08 +0000
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 15:35 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 15:45 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 15:50 -0400
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-16 21:36 -0400
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-16 15:35 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 15:36 -0400
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-16 15:40 -0400
Re: How to downsample this signal? rickman <gnuarm@gmail.com> - 2017-05-16 22:06 -0400
Re: How to downsample this signal? Randy Yates <yates@digitalsignallabs.com> - 2017-05-17 01:25 -0400
Re: How to downsample this signal? Evgeny Filatov <filatov.ev@mipt.ru> - 2017-05-15 14:51 +0300
Re: How to downsample this signal? Randy Yates <randyy@garnerundergroundinc.com> - 2017-05-15 10:37 -0400
Re: How to downsample this signal? makolber@yahoo.com - 2017-05-15 06:27 -0700
Re: How to downsample this signal? Piotr Wyderski <peter.pan@neverland.mil> - 2017-05-15 20:39 +0200
csiph-web